Vulnerability · Published Sep 15, 2025 · Assigned by Mattermost
CVE-2025-9072One-Click Mattermost Account Takeover via Poisoned RelayState SAML Parameter
High 7.6
In plain English
A high-severity open redirect in Mattermost from Mattermost. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.6High
Exploit odds (30 days)0.2%top 92.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Mattermost versions 10.10.x <= 10.10.1, 10.5.x <= 10.5.9, 10.9.x <= 10.9.4 fail to validate the redirect_to parameter, allowing an attacker to craft a malicious link that, once a user authenticates with their SAML provider, could post the user’s cookies to an attacker-controlled URL.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | 10.10.2 | GHSA-69j8-prx2-vx98 |
| Go | github.com/mattermost/mattermost-server | 10.5.10 | GHSA-69j8-prx2-vx98 |
| Go | github.com/mattermost/mattermost-server | 10.9.5 | GHSA-69j8-prx2-vx98 |
| Go | github.com/mattermost/mattermost-server | 10.10.2+incompatible, 10.5.10+incompatible, 10.9.5+incompatible | GO-2025-3958 |
| Go | github.com/mattermost/mattermost-server/v5 | no fix listed | GO-2025-3958 |
| Go | github.com/mattermost/mattermost-server/v6 | no fix listed | GO-2025-3958 |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20250731063404-9eebaadf8f72 | GO-2025-3958 |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20250731063404-9eebaadf8f72 | GHSA-69j8-prx2-vx98 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | 10.10.0 – through 10.10.110.5.0 – through 10.5.910.9.0 – through 10.9.4 |
Weakness: CWE-601 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L